Hospital bed



y 12, 1964' w. w. HUNTRESS ETAL. 3,132,351

HOSPITAL BED 2 Shets-Sheet 1 Filed Oct. 1'7, 1961 INVENTOR W/LL/AM n4 HUNTRESS & HARRY A. SOL/5'5 BY wmwl M ATTORNEY y 1964 w. w. HUNTRESS ETAL HOSPITAL BED 2 Sheets-Sheet 2 Filed Oct. 17, 1961 INVENTORS WILL/AM w. HUNTRESS & HARRY A. $01.55 gm grwwh ATTORNEY United States Patent ice 12,1964

3,132,351 HOSPITAL BED William W. Huntress, 7 30 Dorchester Road, and Harry Soles, 2542 Henetta Ave, both of Akron 20, Ohio; said Huntress assignor of thirty-three and one-third percent to J. William Freeman, Akron, Ohio Filed Oct. 17, 1961, Ser. No. 149,478 13 Claims. (Cl. 63)

This invention relates to the art of bed construction and in particular has reference to improvements in hospital type beds.

In the known prior of hospital bed construction, it has long been known that a spring frame can be pivotally associated with a main rigid supporting frame to permit a patient to be positioned thereon in any one of several different positions. In a normal instance, patients in hospitals are placed in beds wherein there is a pivoted torso portion that is swingable upwardly so as to be inclined from horizontal and thus elevate the head and shoulders of the patient using the same. Normally, this type of hospital bed is provided with a further hinged portion that is employed to support the hip and leg portions of a patient. In this regard, it is conventional to make this portion of the spring frame in two sections, with the hip section being pivoted to the main frame, while the leg portion is, in turn, pivoted to the free end of the hip portion of the frame. In this manner, there with be a knee break provided and the hips of the patient will be'prevented from shifting during the time that the head portion of the bed is elevated.

While devices of this general type havebeen known for some time, the conventional prior art has contemplated the operation of the same by use of a plurality of crank handles normally provided adjacent the foot end of the bed. In this regard, it is customary to have one handle operate the torso portion of the spring frame, while another separate and independent handle is employed to create the pivotal movement necessary to form the knee break.

While devices of this general kind operate satisfactorily, the same are disadvantageous in that the need for two separate handles precludes the use of other operating handles at the foot of the bed for other purposes normally desirable in hospital bed construction. In this regard, it is often desired to elevate either the head or the foot portion of the bed so that the spring frame portion, when disposed in its flat condition, is inclined with respect to the floor. Thus, the feet or head of the patient would be elevated dependent upon which pair of leg portions were raised. In this regard, the present practice is to provide a hand threading adjustment that is manually manipulated by a nurse or other attendant to cause the legs to be raised as desired. In this regard, it is believed obvious that this is time consuming and additionally renders it difficult to raise one pair of legs the exact same amount, since if a screw type of arrangement is employed, each leg must be raised the exact same number of turns to cause an equal elevation to occur on each side of the bed.

In addition to the aforementioned disadvantages, the use of a pair of operating handles at the foot of the bed has been subject to the further disadvantage in that this arrangement prevents use of the hospital bed as a recovery chair. This is true because of the fact that these operating cranks normally have shaft portions that extend longitudinally of the bed in the central region thereof. Ac-

' ject of this invention, with other objects of the invention becoming more apparent upon a reading of the following corclingly, there can be no pivoting or dropping of the foot section of the frame so that the bed could be shifted into the position of .a chair, wherein the hip portion of the frame was horizontal, the head portion was elevated approximately to vertical and the leg portion having been dropped through the frame to be in a substantially vertical condition.

It has been found that all of the aforementioned disadvantages can be obviated by making each control handle perform two functions. Thus, by provision of two control handles, a total of four control functions can be performed.

More specifically, it has been found that if each control handle is operatively associated with a control mechanism that selectively operates either one or both of two control cables, that the individual control handle can do the Work of two handles. Applied to hospital bed construction, it accordingly follows that one handle can be used to control the movement of either (1) the head section (2) the knee break or (3) the head portion and knee break in unison. Similarly, the second handle, also associated with a similar control mechanism, could elevate either (1) the foot of the bed (2) the head of the bed or (3) the head and foot of the bed in unison.

As a still further advantage over the prior art, it has been found that if these control elements are disposed in parallel proximity with the side rails of the rigid'frame, and further if the spring frame is made slightly undersized with respect to the dimensions of the main frame, that the leg frame can be provided with retractable pins that Will permit the leg frame, upon pin retraction, to pass through the plane of the main frame and in this fashion, the hospital bed can be converted to a chair type of structure having certain therapeutic advantages.

Additionally, it has been found that if the respective pivotal portions of the spring frame are engaged by pro jecting lugs carried by the main frame so as to limit pivotal movement thereof, further improved results will occur, particularly if the lugs employed are of an adjustable type wherein the extent of projection above the main frame can be controlled. In fashion, the head portion, the hip portion and the leg portion can be positioned so as to be inclined at a certain degree with respect to the main frame.

Production of a hospital bed having the above advantageous features accordingly becomes theprincipal obbrief specification, considered and interpreted in the light of the accompanying drawings.

Of the drawings: 7

FIGURE 1 is a perspective View of the improved hospital bed and showing the position of the component parts in full and chain-dotted lines.

:FIGURE 2 is a perspective view of the improved transmission means.

EFIGURE 3 is a sectional view taken on the lines 3-3 of FIGURE 2.

FIGURE 4 is a sectional view taken on of FIGURE 1.

FIGURE 5 is a sectional View taken on the lines 55 of FIGURE 1.

FIGURES 6 and 7 are sectional views taken on'the the lines 44 lines 66 and 77 of FIGURE 5.

FIGURE '8 is a schematic, perspective view showing the cable layout of the improved hospital bed.

FIGURE 9 is a fragmentary view of one leg section being partly broken away and in section to show the means for etfectuating relative movement.

FIGURE 10 is a fragmentary, perspective view of a modified form of the invention.

Referring now to the drawings and in particular to FIGURE 1 thereof, the improved hospital bed, generally designated by the numeral 10, is shown being of generally rectangular configuration so as to include a main frame 11 and a spring frame 13, with the respective frame members 11 and 13 being elevated above floor level by foot legs 12, 12 and head legs 12a, 12a; the arrangement being such that a handle 14 is operable to move head portion 13a, hip portion 13b and foot portion 130 of the spring frame 13 between the full and chain-dotted line positions of FIGURE 1 upon rotation thereof. Similarly, the handle 15 can be rotated to elevate either the foot or head of the bed above floor level, and in this regard, switching means 20, are shown associated with each handle mechanism 14 and 15 so as to permit the same to perform different functions depending upon the setting of the switching means 20, as will be described.

Considering first the structure of the main rigid frame 11, it will be seen that the same is a generally rectangular configuration so as to include opposed side rails 21 and 22 that extend longitudinally of the bed 10 for interconnection with a head rail 23 and a foot rail 24. Additionally, the rails 23 and 24 are shown having secured thereto, as shown in FIGURE 9, tubular leg elements 25, 25 within which may be telescoped tubular members 26, 26. Each member 25 is shown as further including a bracket 27, about which a pulley 28 is journalled, while each member 26 is provided with a caster 29 and an apertured top plate 30, through which the cable C of FIGURE 9 may be passed and knotted. In this fashion, upward movement of cable C in FIGURE 9 as shown by the arrow, will result in relative upward movement of leg element 25 to, accordingly, cause elevation of frame 11, with such upward movement being achieved by movement of the cables as shown in FIGURE 8, as will hereinafter be described.

In addition to the aforementioned component parts, the side rails 21 and 22 each include upright standards 32 and 33 that are illustrated as being transversely opposed to each other to permit pivotal mounting, as at 34 and 35, of certain components of spring frame 13. A pair of opposed mounting pads 36, 36 (see FIGURE 2) are also secured to rails 21 and 22 adjacent switching means 20 to receive and journal thereon rod 37, with this rod 37 having lugs 38 and 39 secured thereto as shown in FIGURE 1; the arrangement being such that cable 40 may have one end attached to lug 38, while the other end thereof may be played around pulleys 41 and 42 for connection with switching means 20, as will be more fully described in the ensuing paragraphs. Also in this regard, the lug arm 39 (see FIGURE 4) is provided with a roller 44 that can engage the underside of the L-shaped frame component of spring frame 13 and in this manner, upon pivoting of rod 37, the head portion 13a of spring frame 13 will be raised to the chain-dotted line position of FIGURE 1.

A similar rod 45 extends transversely between the rails 22 and 21 and is also equipped with lugs 46 and 47, with lug 46 connecting to the free end of cable 48, while lug 47 has its outer end provided with a roller (not shown) that slidably engages the underside of hip frame 13b in a manner similar to the engagement of roller 44 with head portion 13a. In this regard, the cable 48 is played around pulley 49, as well as pulley 41, for connection with switching means 20, as will be described.

In addition to the aforementioned component parts, the head rail 23 includes at least one upright pin 51, with this pin 51 being preferably threaded so that its extent of projection above head rail 23 can be adjusted. In similar fashion, each side rail 21 and 22 includes sockets 52 and 53, within which are slidably received shiftable blocks 54 and 55, with block 54 terminating in a head member 56, while block 55 terminates in a head member 57, as shown in FIGURE 1. In this regard and referring particularly to FIGURES 5 and 6 of the drawings, the head member 57 has an elongate slot 58 provided on one face thereof for reception of the shaft 60 that is retractably carried by the foot portion 13c of spring frame 13, as will be described. Similarly, each block 55 has transverse bores 59, 59 provided therein and in this manner, a pin 59a can be passed through appropriate openings in each socket 53 and positioned within any one of the openings 59 to control the height of the slot 58 above side rails 21 and 22. It is to be understood in this regard that a similar pin 59b is provided for each socket 52, with the block members 54, 54 thereof having bores 59c, 59c to facilitate adjustment of head member 56 thereof with respect to side rails 21 and 22.

Turning next to a detailed consideration of the spring frame 13, it has been previously described that the head portion 13a thereof and the hip portion 13b thereof are pivoted, as at 34 and 35, to the upright standards 32 and 33. Additionally, however, it will be seen that the leg portion 130 thereof is pivoted, as at 64, to the projecting end of hip frame 13b, with the end transverse rail thereof defining the foot portion of spring frame 13. In this regard, the rail 65 rotatably supports pin member 66, with one axial end of this pin member 66 having secured thereto a hinged handle member 67, while the opposed inner axial end is secured to a rectangular plate 68, to which are pinned shafts 60, 60. In this fashion, the shafts will move about the pivot point of pin 66 and the pin-like ends thereof will either be retracted from or inserted in opposed slots 58, 58 as shown in FIGURE 5.

As mentioned, the handle 67 is hinged as shown in FIGURES 1 and 7 so that after the same has been moved around its pivot point it may then be swung around the hinge point to avoid interference with the main frame during movement to the chair position.

Considering next the structure of the switching means 20, it will first be understood that both switching means are preferably identical in structure and accordingly one structure only will be described, with it being understood that the remaining member is constructed in like fashion. Thus, referring to FIGURE 2, it will be seen that each means 20 includes an internal core member 70 that is provided with an internally threaded aperture that permits reception of the same about a threaded shaft member 71, with one said shaft member 71 being rotated by handle 14, while the opposed shaft member 71 is operated by handle 15. Encircling each core member 70 is a hollow guide member 72, preferably of generally square configuration and being fixed to core 70 as by weld 71a, with through notches 72a and 72b being provided on adjacent corners of each guide member 72 for purposes to be described. Slidably received about each guide member 72 are opposed control elements 73 and 74, both of which are generally U-shaped in cross-sectional configuration and both of which slidably engage and overlie the guide member 72, as best shown in FIGURES 2 and 3 of the drawings. Additionally, each control element 73 has provided thereon upright bosses 7 5, 75, between which are pinned a lever arm 76, with this lever arm 76 being capable of being moved into engagement with a notch 73a that is provided on one corner of the control element 73. A spring 77 normally biases the lever arm 76 to the position of FIGURE 3, and in this regard, it is to be understood that a similar lever arm 78 is pivoted to the control element 74 and is received between bosses 79, 79 thereof so as to be engageable within slot 74a upon biasing thereof by spring 77a.

For the purposes of etfectuating adjustment of switching means 20, the respective lever arms 76 and 78 may be moved out of engagement with the respective notches 73a and 74a by the rotation of a shaft member 80 that is journaled about an outer casing 81, with bosses 82, 82 permitting such journaling of the shaft 80 thereon. An arm 83 carried by shaft 80 has a roller element 84 provided thereon for engagement with the arcuate end of either lever arm 76 or lever arm 78 to cause the same to be pivoted and accordingly disengaged from a position within the aligned notches 72a, 73a or 72b, 74a. In this regard, axially spaced lugs 86, 86 limit axial shifting of rod 80, and it is to be understood that each shaft 80 terminates adjacent foot rail 24 in a handle portion 80a that is disposed adjacent either handle 14 or 15 (see FIG- URE 1).

With reference to the construction of the outer casing 81 and referring to FIGURE 3 of the drawings, it will be seen that this member is of generally hollow, square configuration so as to encircle, in sliding fit, the control elements 73 and 74. Additionally, each outer casing 81 is secured to the appropriate side rail member 21 or 22 by use of welds 88, with the internal wall of the outer casing 81 preferably being provided with opposed longitudinally extending guides 90 and 91 that serve to guide the elements 73 and 74 during relative movement thereof.

For the purpose of limiting the amount of movement of members 73 and/or 74 relative to casing 81 or shaft member 71, the latter (shaft member 71) has provided thereon spacer lugs 94 and 95 (see FIGURE 2), the arrangement being such that these lug members engage the core 7 and accordingly limit the extent of travel thereof. In this regard, lug 95 preferably limits thercore 70 to movement to a position where notches 72a and 72b will be in alignment with notches 73a and 74a, respectively.

In connection with the description of the switching means 20, it is to be remembered that one such switching means only has been described and it will be assumed that the switching means 20 described is associated with the cables 40 and 48, as well as handle 14. It is to be understood, however, that an identical switching unit is associated with the cables 97 and 96 to control the movement of the various leg members and which are operated by handle 15.

In use or operation of the improved mechanism, it will be first assumed that the component parts have been assembled as indicated and at this time, it will further be assumed that the levers 76 and 78 of each member are locked in position between longitudinally aligned notches 73a and 74a. In this condition, rotational movement of member 71 will result in axial movement of both cables and 48, for example, in unison. If it is desired to move only the cable 40, for example, the shaft 80 may be rotated, whereupon the roller 84 will pivot into engagement with the lever arm 78 so as to disengage the same from notches 74a and 72b (see FIGURE 3). Upon such disengagement, the members 70, 72 and control element 73 will move relatively of the control element 74 as a unit with the result that cable 40 will move, while cable 48 will remain stationary. Conversely, if it is desired to move only the cable 48, the shaft 80 may be moved in an opposite direction, at which time the lever 76 will be disengaged from notches 72a and 73a to permit relative movement to occur between members 72 and 73. It is believed apparent that this arrangement will permit selective operation of either or both cables 40 and 48, and accordingly, upon movement of either member 73 or 74 in the schematic view of FIGURE 8, cable movement will occur as indicated thereon.

Similarly, when the handle 15 is operated, the switching means associated therewith can control movement of either or both of cables 97 and 96. In this fashion, either foot or head legs 12 and 12a, respectively, can be raised, or if desired, said legs can be raised in unison.

By like token, if it is desired to merely lower the end of the bed and create a chair type of structure, it is merely necessary that the handle 67 be pivoted, at which time an eccentric pivoting of shaft members 60, 60 will occur to cause the same to disengage from opposed slots 58, 58,

6 at which time the foot portion 130 may fall around its pivot point 64 so that the bed may be used as a chair upon elevation of head section 13a. Also to incline the head of the bed, the pin 51 may be adjusted, while inclination of the foot or hip portion may be achieved by adjustment of sockets 52 and 53, as described.

The modified form of the invention shown in FIGURE 10 merely contemplates the provision of an alternate type of support arrangement between the spring frame portion 13b and the main frame 11 and is designed to replace the socket member 52 that has been described in connection with FIGURES 1 through 9 of the drawings.

Accordingly, in FIGURE 10, the hip portion 13b of spring frame 13 is shown having pivoted thereto a frame member 100, with the usual bolt 101 being employed so as to permit swingable mounting of the member with respect to the frame portion 13b. The depending end of member 100 is provided with a roller 102, with this roller being journaled on the projecting end of a transversely extending shaft member 103; the arrangement being such that an identical frame member 100 and roller 102 are provided on the transversely opposed hip portion 13b so as to be connected by the transversely extending shaft member 103.

Additionally, each side rail portion 21 and 22 has the horizontal face 21a thereof provided with a groove 104, within which each roller 102 may be received as shown in FIGURE 10. Similarly, a block is secured to the face 21a at a longitudinally spaced distance from the slot 104 and in this fashion, the roller 102 can be moved out of slot or depression 104 and rolled into contact with block 105. This will cause a general lowering of the hip portion 1317 around pivot point 35. In this regard, it is to be understood that upon operation of the handle 67 the shaft members 60, 60 could be retracted and subsequently engaged with the face surfaces 21a, 21a of the opposed side rails 21 and 22 and in this fashion, the hip portion 13b and foot portion will be in coplanar relationship with each other but would be inclined with respect to the side rails 21 and 22. In use of this type of arrangement, it is preferred that the head portion 13a also be lowered so as to permit the small area of the back to be elevated to the maximum height above main frame 11, while the head and foot portions of the spring frame will be dropped into adjacency with end rails 23 and 24, respectively.

It is to be understood that in this regard, the block 105 could be replaced by a gatch having a series of pockets within which the member 102 could be received, and in this manner, various settings could be obtained.

While a full and complete disclosure of the invention has been made in accordance with the dictates of the patent statutes, it is to be understood that the invention is not intended to be so limited. Accordingly, where appropriate, modifications of the invention may be resorted to without departing from the spirit hereof or the scope of the appended claims.

This application is a continuation-in-part of applicants application, Serial No. 757,041, filed August 25, 1958, and now abandoned.

What is claimed is:

1. A control device for use with a pair of control cables, comprising; a frame; a screw rotatably carried by said frame and having an operating handle; a lug threaded on said screw; an elongate guide member fixed to and encircling said lug; a first control element secured to one said cable and partially surrounding said guide member in slidable relationship therewith; a second control element secured to said remaining cable and partially surrounding said guide member in slidable relationship therewith; first and second lever arms carried by said first and second control elements and each being selectively engageable with said guide member in interlocked relationship therewith; and means disposed adjacent said handle for selectively moving said levers into and out of interlocked relationship with said guide member.

2. A hospital bed of the character described, comprising; a rigid frame of substantially rectangular configuration; front .and rear supporting legs connected to said frame; a spring frame including a head portion and a base portion, respectively pivoted to said frame; a first shaft extending longitudinally of said frame and being rotationally supported thereon; a first drive member movable axially of said first shaft; first and second control elements supported by said first drive member and being respectively connected to said head and base portion by control cables, with said first and second control elements respectively pivoting said head and base portion relatively of said rigid frame upon interlocking thereof with said first drive member, followed by movement of said first drive member axially of said first shaft; first cam and lever means carried by said rigid frame and selectively controlling interlocking of each of said first and second control elements with said first drive member during rotation of said first shaft; a second shaft extending longitudinally of said frame and being rotationally supported thereon; a second drive member movable axially of said second shaft; third and fourth control elements supported by said second drive member and being respectively connected to said front and rear supporting legs by control cables, with said third and fourth control elements respectively moving said front and rear supporting legs relatively of said rigid frame upon interlocking thereof with said second drive member followed by movement of said second drive member relatively of said second shaft; and second cam and lever means carried by said rigid frame and selectively controlling interlocking of said third and fourth control elements with said second driving member during rotation of said second shaft.

3. The device of claim 2 further characterized by the fact that said first drive member will move said first control element axially of said first shaft during inter locking between said drive member and said first control element, will move said second control element axially of said first shaft during interlocking between said drive member and said second control element, and will move said first and second control elements axially of said first shaft in unison during interlocking between said drive member and said first and second control elements.

4. The device of claim 2 further characterized by the fact that said second drive member will move said third control element axially of said second shaft during interlocking between said drive member and said third control element; will move said fourth control element axially of said second shaft during interlocking between said drive member and said fourth control element; and Will move said third and fourth control elements axially of said second shaft in unison during interlocking between said drive member and said third and fourth control elements.

5. A hospital bed of the character described, comprising; a rigid frame; a spring frame having head and base portions pivoted to said rigid frame; first and second pairs of supporting legs secured to opposed ends of said rigid frame; an operating handle disposed adjacent one end of said rigid frame; a driving member movable relatively of said rigid frame in a lineal direction upon operation of said operating handle; first and second control elements secured to said head and base portions by control cables and effectuating pivotal movement thereof relatively of said frame upon movement of said control elements relatively of said rigid frame; and cam and lever means for selectively interlocking either of said control elements with said driving member for movement therewith upon operation of said operating handle; said control member that is interlocked with said driving member pivoting said spring frame portion associated therewith upon movement of said driving member.

6. The device of claim 5 further characterized by the fact that said first and second control elements will pivot said base and head portions together when both of said control elements are iIItCIlOciLCd with said moving drive element.

7. The device of claim 5 further characterized by the presence of a second drive member; third and fourth control elements secured to said first and second pairs of legs by cables and second cam and lever means for selectively interlocking either of said control elements with said drive member; said third and fourth control elements shifting said first and second pairs of legs in unison relatively of said frame during interlocking between said second drive member and said third and fourth control elements; said third control element shifting said first pair of legs in unison relatively of said frame during interlocking between said second drive means and said third control element; said fourth control element shifting said econd pair of legs in unison relatively of said frame during interlocking between said second drive means and said fourth control element.

8. A hospital bed of the character described, comprising; a rigid frame of substantially rectangular configuration; front and rear supporting legs connected to said frame; a spring frame including a head portion and a base portion respectively pivoted to said frame; a first shaft extending longitudinally of said frame and being rotationally supported thereon; a driving member movable axially of said shaft; first and second control elements supported by said driving member and being respectively connected to said head and base portions by control cables, with said control elements respectively pivoting said head and base portions relatively of said rigid frame upon interlocking thereof with said drive member followed by movement of said drive member relatively of said shaft; and cam and lever means carried by said frame and selectively interlocking said control elements with said drive member for movement thereon during rotation of said shaft.

9. The device of claim 8 further characterized by the presence of means for selectively moving said front and rear supporting legs relatively of said frame.

10. A hospital bed of the character described, comprising; a rigid frame of substantially rectangular configuration; front and rear supporting legs connected to said frame; a spring frame including a head portion and a base portion respectively pivoted to said frame; a shaft extendin longitudinally of said frame and being rotationally supported thereon; a driving member movable axially of said shaft; first and second control elements supported by said driving member and being respectively connected to said front and rear supporting legs by con trol cables, with said control elements respectively moving said front and rear supporting legs relatively of said rigid frame upon interlocking thereof with said driving member followed by movement of said driving member relatively of said shaft; and cam and lever means carried by said frame and selectively controlling interlocking of said control elements with said driving member during rotation of said shaft.

11. The device of claim 10 further characterized by the presence of means for pivoting said head and base portions of said base frame relatively of said rigid frame.

12. The device of claim 8 further characterized by the fact that said drive member moves said first control element axially of said shaft upon interlocking between said drive member and said first control element; moves said second control element axially of said shaft upon interlocking between said drive member and said second control element; and moves said first and second control elements in unison axially of said shaft upon interlocking of said drive member with said first and second control elements.

13. The device of claim 10 further characterized by the fact that said drive member moves said first control element axially of said shaft during interlocking between said drive member and said first control element; moves said second control element axially of said shaft during interlocking between said drive member and said second control element; and moves said first and second control elements in unison axially of said shaft during interlocking between said drive member and said first and second control elements.

References Cited in the file of this patent UNITED STATES PATENTS 1,055,241 Terry Mar. 4, 1913 10 Staufenbiel May 21, 1929 Bell May 17, 1932 Lindquist Sept. 19, 1950 Holm Dec. 9, 1952 Dawson May 29', 1956 Reichert et a1 Mar. 25, 1958 Williams et a1. Mar. 19, 1963 

5. A HOSPITAL BED OF THE CHARACTER DESCRIBED, COMPRISING; A RIGID FRAME; A SPRING FRAME HAVING HEAD AND BASE PORTIONS PIVOTED TO SAID RIGID FRAME; FIRST AND SECOND PAIRS OF SUPPORTING LEGS SECURED TO OPPOSED ENDS OF SAID RIGID FRAME; AN OPERATING HANDLE DISPOSED ADJACENT ONE END OF SAID RIGID FRAME; A DRIVING MEMBER MOVABLE RELATIVELY OF SAID RIGID FRAME IN A LINEAL DIRECTION UPON OPERATION OF SAID OPERATING HANDLE; FIRST AND SECOND CONTROL ELEMENTS SECURED TO SAID HEAD AND BASE PORTIONS BY CONTROL CABLES AND EFFECTUATING PIVOTAL MOVEMENT THEREOF RELATIVELY OF SAID FRAME UPON MOVEMENT OF SAID CONTROL ELEMENTS RELATIVELY OF SAID RIGID FRAME; AND CAM AND LEVER MEANS FOR SELECTIVELY INTERLOCKING EITHER OF SAID CONTROL ELEMENTS WITH SAID DRIVING MEMBER FOR MOVEMENT THEREWITH UPON OPERATION OF SAID OPERATING HANDLE; SAID CONTROL MEMBER THAT IS INTERLOCKED WITH SAID DRIVING MEMBER PIVOTING SAID SPRING FRAME PORTION ASSOCIATED THEREWITH UPON MOVEMENT OF SAID DRIVING MEMBER. 